This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A298117 #13 Feb 16 2025 08:33:53 %S A298117 2,4,4,8,40,8,16,320,320,16,32,2368,8616,2368,32,64,16832,207496, %T A298117 207496,16832,64,128,116608,4788808,15639936,4788808,116608,128,256, %U A298117 793088,108326760,1116199200,1116199200,108326760,793088,256 %N A298117 Array read by antidiagonals: T(m,n) = number of Eulerian cycles in the torus grid graph C_m X C_n. %H A298117 Andrew Howroyd, <a href="/A298117/b298117.txt">Table of n, a(n) for n = 1..105</a> %H A298117 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/EulerianCycle.html">Eulerian Cycle</a> %H A298117 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TorusGridGraph.html">Torus Grid Graph</a> %e A298117 Array begins: %e A298117 ========================================================================= %e A298117 m\n| 1 2 3 4 5 6 %e A298117 ---|--------------------------------------------------------------------- %e A298117 1 | 2 4 8 16 32 64 ... %e A298117 2 | 4 40 320 2368 16832 116608 ... %e A298117 3 | 8 320 8616 207496 4788808 108326760 ... %e A298117 4 | 16 2368 207496 15639936 1116199200 77643032832 ... %e A298117 5 | 32 16832 4788808 1116199200 242230440480 50917973008584 ... %e A298117 6 | 64 116608 108326760 77643032832 50917973008584 32098460087825856 ... %e A298117 ... %Y A298117 Rows 2..4 are A298198, A282621, A298197. %Y A298117 Main diagonal is A297385. %Y A298117 Cf. A212801, A298119. %K A298117 nonn,tabl %O A298117 1,1 %A A298117 _Andrew Howroyd_, Jan 12 2018